For the vast majority of tourists and residents, the answer is a resounding no; you do not need a car in London. The city possesses one of the most comprehensive public transport networks in the world, including the London Underground (The Tube), the Elizabeth Line, and the iconic red double-decker buses. Driving in central London is intentionally difficult and expensive due to the Congestion Charge (£15/day) and the Ultra Low Emission Zone (ULEZ) charges. Parking is notoriously scarce and can cost more than a high-end dinner. Furthermore, London is a highly walkable city where many major sights—like the South Bank, Covent Garden, and Westminster—are better explored on foot. You should only consider a car if you are planning multiple day trips to remote parts of the English countryside (like the Cotswolds) where train service is less frequent, but even then, renting a car just for those specific days is far more logical.